Description 50mm Self Weld Aluminium Fuel Filler Cap CMB7856 50mm BODY 60mm Cap 90mm Length These Self Weld components are for any special tank builds that are for a specific Race Car application. All our fuel fillers have a sealing 'O' ring in the top. This products is manufactured out of grade 6061 Aluminium. Aluminium 6061 is a medium to high strength heat-treatable alloy. It has very good corrosion resistance and very good weldability although reduced strength in the weld zone. It has medium fatigue strength. 6061 is typically used for heavy duty structures in: Motorsport Applications Ship Building Military Applications Aerospace applications including helicopter rotor skins Motorboats Compbrake motorsport ++4 (0) 1744 895888.